NOTICE:¬This¬standard¬has¬either¬been¬superseded¬and¬replaced¬by¬a¬new¬version¬or discontinued.¬Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.¬ Designation: A 953 – 96 An American National Standard AMERICAN SOCIETY FOR TESTING AND MATERIALS 100 Barr Harbor Dr., West Conshohocken, PA 19428 Reprinted from the Annual Book of ASTM Standards Copyright ASTM Standard Specification for Austenitic Chromium-Nickel-Silicon Alloy Steel Seamless and Welded Tubing1 This standard is issued under the fixed designation A 953; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision A number in parentheses indicates the year of last reapproval A superscript epsilon (e) indicates an editorial change since the last revision or reapproval Stainless Steel Tubing (Small-Diameter) for General Service3 2.2 ANSI Standard: B 31.3 Chemical Plant and Petroleum Refinery Piping4 2.3 ASME Pressure Vessel Code: Section VIII Division 1, Pressure Vessels5 Scope 1.1 This specification covers grades of nominal-wallthickness, austenitic alloy steel tubing for general corrosionresisting and low- or high-temperature service, having a specified minimum chromium content of less than 10.50 % 1.2 The tubing sizes and thicknesses usually furnished to this specification are 1⁄4 in (6.4 mm) in inside diameter and larger and 0.020 in (0.51 mm) in nominal wall-thickness and heavier 1.3 Mechanical property requirements not apply to tubing smaller than 1⁄8 in (3.2 mm) in inside diameter or 0.015 in (0.38 mm) in thickness 1.4 Some steels covered by this specification, especially the high silicon containing steels, because of their particular alloy content and specialized properties, may require special care in their fabrication and welding Specific procedures are of fundamental importance, and it is presupposed that all parameters will be in accordance with approved methods capable of producing the desired properties in the finished fabrication 1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other Combining values from the two systems may result in nonconformance with the specification Unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished in inch-pound units Ordering Information 3.1 Orders for material under this specification should include the following, as required, to describe the desired material adequately: 3.1.1 Quantity (feet, metres, or number of lengths), 3.1.2 Name of material (seamless or welded tubes), 3.1.3 Grade (Table 1), 3.1.4 Size (outside diameter and nominal wall thickness), 3.1.5 Length (specific or random), 3.1.6 Test report required (see Section on Inspection of Specification A 450/A 450M), 3.1.7 Specification designation, and 3.1.8 Special requirements General Requirements 4.1 Material furnished under this specification shall conform to the applicable requirements of the current edition of Specification A 450/A 450M, unless otherwise provided herein Manufacture 5.1 The tubes shall be made by the seamless or welded process 5.2 At the manufacturer’s option, tubing may be furnished either hot finished or cold finished Referenced Documents 2.1 ASTM Standards: A 370 Test Methods and Definitions for Mechanical Testing of Steel Products2 A 450/A450M Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes3 A 480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip2 A 632 Specification for Seamless and Welded Austenitic Heat Treatment 6.1 All material shall be furnished in the heat-treated condition Except as provided in 6.2, the heat-treatment procedure shall, consist of heating the material to a minimum temperature of 1900°F (1040°C) and quenching in water or rapidly cooling by other means This specification is under the jurisdiction of ASTM Committee A-1 on Steel, Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee A01.10 on Steel Tubing Current edition approved March 10, 1996 Published May 1996 Annual Book of ASTM Standards, Vol 01.03 Annual Book of ASTM Standards, Vol 01.01 Available from American National Standards Institute, W 42nd St., 11th Floor, New York, NY 10036 Available from American Society for Mechanical Engineers, 345 E 47th St., New York, NY 10017 tailieuxdcd@gmail.com NOTICE:¬This¬standard¬has¬either¬been¬superseded¬and¬replaced¬by¬a¬new¬version¬or discontinued.¬Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.¬ A 953 TABLE Chemical Requirements TABLE Number of Tubes in a Lot Heat Treated by the Continuous Process Grade S70003 Size of Tube UNS Designation C max Mn max P max S max Si Ni Cr Mo max Fe Size of Lot in and over in outside diameter and 0.200 in (5.08 mm) and over in wall thickness Less than in but over in in outside diameter or over in in outside diameter and under 0.200 in (5.06 mm) in wall thickness in or less in outside diameter 0.020 2.00 0.025 0.010 6.5–8.0 22.0–25.0 8.0–11.0 0.50 Balance not more than 50 tubes not more than 75 tubes not more than 125 tubes 9.3 Hardness Test—Brinell or Rockwell hardness determination shall be made on specimens from two tubes from each lot The term lot applies to all tubes prior to cutting, of the same nominal diameter and wall thickness that are produced from the same heat of steel When final heat treatment is in a batch-type furnace, a lot shall include only those tubes of the same size and the same heat which are heat treated in the same furnace charge When the final heat treatment is in a continuous furnace, a lot shall include all tubes of the same size and heat, heat treated in the same furnace at the same temperature, time at heat, and furnace speed 9.4 When more than one heat is involved, the flaring, flanging, and hardness test requirements shall apply to each heat 9.5 Reverse Flattening Test—For welded tubes, one reverse flattening test shall be made on a specimen from each 1500 ft (460 m) of finished tubing Coiled tubing greater than 1500 ft (450 m) in length shall be sampled at both ends A coil must be continuous without any circumferential butt welds 9.6 Hydrostatic or Nondestructive Electric Test—Each tube, seamless or welded, shall be subjected to the Nondestructive Electric Test or the Hydrostatic Test Unless specified by the purchaser, either test may be used at the option of the producer 6.2 Controlled structural or special service characteristics shall be specified as a guide for the most suitable heat treatment If the final heat treatment is at a temperature under 1900°F and is so specified on the order, each tube shall be stenciled with the final heat treatment temperature in degrees Fahrenheit after the suffix “HT.” 6.3 S70003 shall be heat treated in the range 1920°F (1050°C) minimum to 2010°F (1100°C) maximum followed by a water quench or rapid cooling by other means Chemical Composition 7.1 The steel shall conform to the requirements as to chemical composition as prescribed in Table Product Analysis 8.1 An analysis of either one billet or one length of flat-rolled stock or one tube shall be made from each heat The chemical composition thus determined shall conform to the requirements specified 8.2 A product analysis tolerance found in the Chemical Requirements (Product Analysis Tolerances) table in Specification A 480/A 480M shall apply The product analysis tolerance is not applicable to the carbon content for material with a specified maximum carbon of 0.04 % or less 8.3 If the original test for product analysis fails, retests of two additional billets, lengths of flat-rolled stock, or tubes shall be made Both retests for the elements in question shall meet the requirements of the specification; otherwise all remaining material in the heat or lot shall be rejected or, at the option of the producer, each billet, length of flat-rolled stock, or tube may be individually tested for acceptance Billets, lengths of flat-rolled stock, or tubes which not meet the requirements of the specification shall be rejected 10 Hardness Requirements 10.1 S70003 shall have a maximum hardness of 220 HV or 95 HRB in the annealed condition 10.2 For tubing less than 0.065 in (1.65 mm) in wall thickness, it is permissible to use the Rockwell superficial hardness test or the Vickers hardness test The superficial hardness number for S70003 shall not exceed 79 on the 30 T scale or 91 on the 15 T scale 10.3 No hardness test shall be required on tubes smaller than 1⁄4 in (6.4 mm) in inside diameter or tubes having a wall thickness thinner than 0.020 in (0.51 mm) Mechanical Tests Required 9.1 Flaring Test (Seamless Tubes)—One test shall be made on specimens from one end of one tube from each lot (Note 1) of finished tubes 11 Tensile Requirements 11.1 The tensile properties of the material shall conform to the requirements of Table NOTE 1—The term lot applies to all tubes prior to cutting to length of the same nominal size and wall thickness which are produced from the same heat of steel When final heat treatment is in a batch-type furnace, a heat-treatment lot shall include only those tubes of the same size and from the same heat that are heat treated in the same furnace charge When the final heat treatment is in a continuous furnace, the number of tubes of the same size and from the same heat in a heat-treatment lot shall be determined from the size of the tubes as prescribed in Table 12 Permissible Variations in Dimensions 12.1 Variations in outside diameter, wall thickness, and length, from those specified, shall not exceed the amounts prescribed in Table 12.2 The permissible variations in outside diameter given in Table are not sufficient to provide for ovality in thin-walled tubes, as defined in the table In such tubes, the maximum and minimum diameters at any cross section shall deviate from the nominal diameter by no more than twice the permissible 9.2 Flange Test (Welded Tubes)—One test shall be made on specimens from one end of one tube from each lot (Note 1) of finished tubes tailieuxdcd@gmail.com NOTICE:¬This¬standard¬has¬either¬been¬superseded¬and¬replaced¬by¬a¬new¬version¬or discontinued.¬Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.¬ A 953 TABLE Tensile Requirements Grade UNS Designation Tensile Strength, psi (MPa) 0.2 Y.S psi (MPa) Elongation in or 50 mm or 4D min, % S70003 78 (540) 35 (240) 40 TABLE Permissible Variations in Dimensions Group Size, Outside Diameter, in Permissible Variations in Outside Diameter, in (mm) Permissible Variations in Wall Thickness,A % Permissible Variations in Cut Length, in (mm)B Over Under ⁄ (3.2) ⁄ (3.2) 0 (4.8) ⁄ (4.8) ⁄ Up to 1⁄2 ⁄ to 11⁄2, excl 60.005 (0.13) 60.005 (0.13) 615 610 18 12 1⁄2 to 1⁄2, excl 60.010 (0.25) 610 16 ⁄ to ⁄ , excl 60.015 (0.38) 610 16 51⁄2 to 8, excl 60.030 (0.76) 610 16 12 12 18 ⁄ (4.8) Thin Walled TubesC less than 0.065 in nominal less than 0.095 in nominal less than 0.150 in nominal less than 0.150 in nominal (1.65 mm) (2.41 mm) (3.81 mm) (3.81 mm) A When tubes as ordered require wall thicknesses 3⁄4 in (19.0 mm) or over, or an inside diameter 60 % or less of the outside diameter, a wider variation in wall thickness is required On such sizes a variation in wall thickness of 12.5 % over or under will be permitted For tubes less than 1⁄2in (12.7 mm) in inside diameter which cannot be successfully drawn over a mandrel, the wall thickness may vary 615 % from that specified B These tolerances apply to cut lengths up to and including 24 ft (7.3 m) For lengths over 24 ft an additional over tolerance of 1⁄8in (3.2 mm) for each 10 ft (3.0 m) or fraction thereof shall be permissible, up to a maximum tolerance of 1⁄2 in (12.7 mm) C Ovality provisions of 12.2 apply variation in outside diameter given in Table 3; however, the mean diameter at that cross section must still be within the given permissible variation degrees Fahrenheit after the suffix “HT” if the final heat treatment temperature is under 1900°F (1040°C) 14.2 When the Nondestructive Electric Test is performed, each length of tubing shall be marked with the letters “NDE,” and the certification, when required, shall also indicate this test 13 Surface Condition 13.1 The tubes shall be pickled free of scale When bright annealing is used, pickling is not necessary 15 Keywords 14 Product Marking 14.1 In addition to the marking prescribed in Specification A 450/A 450M, the marking shall include whether the tubing is seamless or welded and the final heat-treatment temperature in 15.1 steel; tube The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, 100 Barr Harbor Drive, West Conshohocken, PA 19428 tailieuxdcd@gmail.com